Flow, level & control
Hart monitoring of flow meters to increase accuracy
Vo Volume flow 4-20 m +A HART
Prima yr
HCS HES HART
Ethern et Gatew Syst
stem M
any industries rely on the availability of water for their processes and to succeed in the current climate, companies must adapt to the
changing conditions. Major companies are now marketing their “green” credentials. With iron ore mining, saving water in the washing process can lead to further savings down the process chain where water usage could be as high as 800 cubic meters/hour for the processing of 800 tons/hour of ore. The primary water source is saline water from underground bores, they manage the water resource with water re-injection, and the process owner is accountable for the water use. To achieve this the engineers require an improvement in accuracy over the existing 4-20mA loop from the magnetic flow meters to their PLC, where they have also identified the totalisation of the pulse count from the meter is not accurate. With the existing magnetic flow meter, they can tap into
the improved digital resolution of the meter using HART protocol and the HCS HART to MODBUS Converter. The HCS is connected in parallel with the existing 4-20mA loop, and reads the primary process variable (PV)→Volume flow plus secondary process variable (SV)→Totaliser.
Enclosure for Hockey-Puck instruments. SB Stainless Steel Housing with Glass CoverThe SB meets standards for enclosing indoor and outdoor electronic instruments approved for use in explosion-proof/flameproof, dust- ignition proof, and intrinsically-safe locations. The SB field mount, explosion
M
proof/flameproof instrument housing is non- corrosive stainless steel 316, electro polished and passivated that meets NEMA 4X and IP66 ratings and is designed for highly corrosive environments such as offshore platforms and chemical facilities. Available with a solid metal or
28
RT to eway
HART to MODBUS Conv
HA onverter
VolVolu em
S coe nd pro
Totalizer roce
To
R S485 MODBUS R UT AdditionAl ConsiderAtions
In some applications, flow rate and flow totalisation are critical variables. A facility will use a flow meter that they believe is producing accurate flow measurement and integration, but by the time that data gets into the SCADA, the values are questionable. There are several variables that may contribute to the questionable data quality like the accuracy and resolution of your input cards or timing issues in reading a pulse output. Reading the data digitally can eliminate any and all
variables. Since the flow rate and totalisation are already digital in the flow meter, a HART master product like the HCS can be used because it takes the 32-bit floats from the flow meter and delivers them as MODBUS 32-bit floats to the SCADA. Once the rate and totalisation is digital, it is best to keep it digital all the way back to the destination, and the HCS accomplishes that with its serial MODBUS RTU, RS-485 output. If Ethernet communications is required instead, the HES HART to Ethernet Gateway System outputs over Ethernet using the MODBUS/TCP protocol.
Moore Industries
www.miinet.com SB StainleSS Steel exploSion-proof/flameproof encloSureS
oore Industries now offers the SB stainless steel Explosion-Proof/ Flameproof Field-Mount Instrument
a glass cover, it is suited for instruments with or without a display. The SB housing has two metric or NPT conduit side entry ports. Choose from two or three-hub configurations that include combinations of M20, ½-inch and ¾-inch NPT ports. All the information you need on the SB is at
your fingertips in the online Moore Industries’ catalogue. The catalogue features easy-to- download information such as data sheet, CAD drawings and specifications. The 3D models are accessible on the product page by clicking on the 3D cube in the lower corner of the product photo. You can download the 3D model in any
of several popular 3D CAD file formats.
www.miinet.com
January 2021 Instrumentation Monthly
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